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# ap stats chapter 6 test?

the internal revenue service estimates that 8% of all taxpayers filling out forms make mistakes.

a) an irs employee randomly selects and checks 10 forms for mistakes. what is the probability that exactly one has an error?

b) the same irs employee announces at lunch one day that she is going to check 25 randomly selected forms after lunch. calculate the mean and the standard deviation of the of forms with mistakes she should expect to find.

c) the irs employee checked 25 randomly selected forms and didn’t find any mistakes. does this provide convincing evidence to cause her supervisor to believe that she is missing mistakes? explain

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